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Just A Moment... [file Archive]

  • For other Outlook versions, please see Microsoft's instructions: How to compact PST and OST files.Archive your old items. One more way to reduce the size of your Outlook file is to archive older emails using the AutoArchive feature. If you need the detailed instructions, I'll refer you to Microsoft again: AutoArchive settings explained.

Let Outlook auto-archive or synchronize without interruptionSince we've started to talk about archiving, be aware that Outlook consumes even more resources than usually when it is archiving your emails or synchronizing messages and contacts with your mobile device, which results in a bigger response time. Don't push it and let it finish the job :) Usually, Outlook displays a special icon on its status bar or on the Windows system tray when auto-archiving or synchronization is in progress. Don't take any actions in Outlook during this period and you'll be safe.Turn off your antivirus softwareSometimes outdated or over-protective anti-virus / anti-spam programs can conflict with Outlook or with one of your Outlook add-ins. As a result, the anti-virus blocks the add-in and prevents Outlook from functioning properly.

Just a moment... [file archive]


Hello.I have a problem where when I go into my email, Outlook only shows a couple of emails and files and has (PREVIEW) next to outlook name. Therefore I cannot do anything with the page at all??I am with hotmail and usually goes to and then my email would come up and no problems. I did not change to Outlook, it just comes up now and does what I said above. I would appreciate any help you can give me.Kind Regards. Louise

One golden rule is simplicity. For example, limit your tararchives to contain only regular files and directories, avoidingother kind of special files. Do not attempt to save sparse files orcontiguous files as such. Let's discuss a few more problems, in turn.

If you intend to have your tar archives to be read under MSDOS,you should not rely on case distinction for file names, and you mightuse the GNU doschk program for helping you further diagnosingillegal MSDOS names, which are even more limited than System V's.

Normally, when tar archives a symbolic link, it writes ablock to the archive naming the target of the link. In that way, thetar archive is a faithful record of the filesystem contents.`--dereference' (`-h') is used with `--create' (`-c'), and causes tarto archive the files symbolic links point to, instead of the linksthemselves. When this option is used, when tar encounters asymbolic link, it will archive the linked-to file, instead of simplyrecording the presence of a symbolic link.

The name under which the file is stored in the file system is notrecorded in the archive. To record both the symbolic link name andthe file name in the system, archive the file under both names. Ifall links were recorded automatically by tar, an extracted filemight be linked to a file name that no longer exists in the filesystem.

Certain old versions of tar cannot handle additionalinformation recorded by newer tar programs. To create anarchive in V7 format (not ANSI), which can be read by these oldversions, specify the `--old-archive' (`-o') option inconjunction with the `--create' (`-c'). tar alsoaccepts `--portability' for this option. When you specify it,tar leaves out information about directories, pipes, fifos,contiguous files, and device files, and specifies file ownership bygroup and user IDs instead of group and user names.

For longer or non-fitting file names, we plan to use yet another setof GNU extensions, but this time, complying with the provisions POSIXoffers for extending the format, rather than conflicting with it.Whenever an archive uses old GNU tar extension format or POSIXextensions, would it be for very long file names or other specialities,this archive becomes non-portable to other tar implementations.In fact, anything can happen. The most forgiving tars willmerely unpack the file using a wrong name, and maybe create anotherfile named something like `@LongName', with the true file namein it. tars not protecting themselves may segment violate!

A few users requested that `--sparse' (`-S') be always active bydefault, I think that before replying to them, we have to decideif we want GNU tar to go closer to POSIX on average, whileproducing files. My choice would be to go closer to POSIX in thelong run. Besides possible double reading, I do not see any pointof not trying to save files as sparse when creating archives whichare neither POSIX nor old-V7, so the actual `--sparse' (`-S') wouldbecome selected by default when producing such archives, whateverthe reason is. So, `--sparse' (`-S') alone might be redefined to forceGNU-format archives, and recover its previous meaning from this fact.

GNU-format as it exists now can easily fool other POSIX tar,as it uses fields which POSIX considers to be part of the file nameprefix. I wonder if it would not be a good idea, in the long run,to try changing GNU-format so any added field (like ctime,atime, file offset in subsequent volumes, or sparse filedescriptions) be wholly and always pushed into an extension block,instead of using space in the POSIX header block. I could manageto do that portably between future GNU tars. So other POSIXtars might be at least able to provide kind of correct listingsfor the archives produced by GNU tar, if not able to processthem otherwise.

Using these projected extensions might induce older tarsto fail. We would use the same approach as for POSIX. I'll putout a tar capable of reading POSIXier, yet extended archives,but will not produce this format by default, in GNU mode. In a fewyears, when newer GNU tars will have flooded out tar1.11.X and previous, we could switch to producing POSIXier extendedarchives, with no real harm to users, as almost all existing GNUtars will be ready to read POSIXier format. In fact, I'lldo both changes at the same time, in a few years, and just preparetar for both changes, without effecting them, from 1.12.(Both changes: 1--using POSIX convention for getting over 100characters; 2--avoiding mangling POSIX headers for GNU extensions,using only POSIX mandated extension techniques).

In a few years, when GNU tar will produce POSIX headers bydefault, `--posix' will have a strong meaning and will disallowGNU extensions. But in the meantime, for a long while, `--posix'in GNU tar will not disallow GNU extensions like `--label=archive-label' (`-V archive-label'),`--multi-volume' (`-M'), `--sparse' (`-S'), or very long file or link names.However, for 1.12, `--posix' with GNU extensions will use POSIXheaders with reserved-for-users extensions to headers, and I will becurious to know how well or bad POSIX tars will react to these.

SunOS and HP-UX tar fail to accept archives created using GNUtar and containing non-ASCII file names, that is, file nameshaving characters with the eight bit set, because they use signedchecksums, while GNU tar uses unsigned checksums while creatingarchives, as per POSIX standards. On reading, GNU tar computesboth checksums and accept any. It is somewhat worrying that a lot ofpeople may go around doing backup of their files using faulty (or atleast non-standard) software, not learning about it until it's timeto restore their missing files with an incompatible file extractor,or vice versa.

This option causes all files to be put in the archive to be tested forsparseness, and handled specially if they are. The `--sparse' (`-S')option is useful when many dbm files, for example, are beingbacked up. Using this option dramatically decreases the amount ofspace needed to store such a file.

In later versions, this option may be removed, and the testing andtreatment of sparse files may be done automatically with any specialGNU options. For now, it is an option needing to be specified onthe command line with the creation or updating of an archive.

Files in the filesystem occasionally have "holes." A hole in a fileis a section of the file's contents which was never written. Thecontents of a hole read as all zeros. On many operating systems, actualdisk storage is not allocated for holes, but they are counted in thelength of the file. If you archive such a file, tar could createan archive longer than the original. To have tar attempt torecognize the holes in a file, use `--sparse' (`-S'). When you use the `--sparse' (`-S') option, then, for any file using less disk space thanwould be expected from its length, tar searches the file forconsecutive stretches of zeros. It then records in the archive for thefile where the consecutive stretches of zeros are, and only archives the"real contents" of the file. On extraction (using `--sparse' (`-S') isnot needed on extraction) any such files have hols created wherever thecontinuous stretches of zeros were found. Thus, if you use`--sparse' (`-S'), tar archives won't take more space than theoriginal.

A file is sparse if it contains blocks of zeros whose existenceis recorded, but that have no space allocated on disk. Whenyou specify the `--sparse' (`-S') option in conjunction with the`--create' (`-c') operation, tar tests all files for sparsenesswhile archiving. If tar finds a file to be sparse, it uses asparse representation of the file in the archive. See section Creating a New Archive, formore information about creating archives.

Even if your system has no no sparse files currently, some may becreated in the future. If you use `--sparse' (`-S') while making filesystem backups as a matter of course, you can be assured the archivewill always take no more space on the media than the files take ondisk (otherwise, archiving a disk filled with sparse files might takehundreds of tapes).@FIXME-xrefincremental when node name is set.tar ignores the `--sparse' (`-S') option when reading an archive.

While an archive may contain many files, the archive itself is asingle ordinary file. Like any other file, an archive file can bewritten to a storage device such as a tape or disk, sent through apipe or over a network, saved on the active file system, or evenstored in another archive. An archive file is not easy to read ormanipulate without using the tar utility or Tar mode in Emacs. 041b061a72

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