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Reduce Size Of Outlook 2007 PST and OST Files

By Jason Slater
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Earlier versions of Microsoft Outlook had a file size limit of 2 GB for .PST files and going over that limit could cause some pretty major problems. Fortunately Outlook 2007 has a 20 GB file size limit but you should still keep a regular eye on your PST (Personal Storage) and OST (Offline Storage) file size to ensure it doesn’t grow unnecessarily large.

To check on the size of your PST file

  • Go to Outlook and right-click the relevant folder in the Folder List
  • Click on the Folder Size tab

Over time the PST file will grow large – you can address this by compacting the folder – to do this:

  • Go to Outlook and select Tools
  • Select Account Settings
  • Select the Data Files tab
  • Click on the relevant PST file
  • Select Settings
  • Select Compact Now on the General Tab

To compact the OST offline file (remember to empty the deleted items folder first if necessary):

  • Go to Outlook and select Tools
  • Select Account Settings
  • Select the E-mail tab
  • Click on Microsoft Exchange
  • Select Change then click on the button More Settings
  • Select the Advanced Tab then click on the button Offline Folder File Settings
  • Select the button Compact Now

Related

3 comments so far

  • Alex says:

    There is good tool,which works with outlook and possible more type files in this sphere-.ost viewer,as far as i know tool is free,it “allows to recover *.ost files, when Microsoft Exchange Server gets out of order and your data may be lost,open damaged files, you can open your corrupted *.ost file and estimate data losses,can convert *.ost files to *.pst files, that can be easily opened by any email client, compatible with Microsoft Outlook,convert your *.ost to *.pst, but to extract a list of files in such formats, as: *.eml. *.vcf and *.txt,allows to view a ost file and avoid extracting, for example, 50 Mb of your content, you can extract all files from .ost viewer mail, than just to copy and paste emails and contacts, that you need,view ost file runs under all versions of Windows operating system, such as: Windows 98, Windows Me, Windows NT, Windows 2000, Windows 2003, Windows XP and Windows Vista.

  • mutu26 says:

    Advise use good program which works with mails-view ost files,it is free as how as i know,program “allows to recover *.ost files, when Microsoft Exchange Server gets out of order and your data may be lost,open damaged files, you can open your corrupted *.ost file and estimate data losses,can convert *.ost files to *.pst files, that can be easily opened by any email client, compatible with Microsoft Outlook,convert your *.ost to *.pst, but to extract a list of files in such formats, as: *.eml. *.vcf and *.txt,allows to view a ost file and avoid extracting, for example, 50 Mb of your content, you can extract all files from .ost viewer mail, than just to copy and paste emails and contacts, that you need,view ost file runs under all versions of Windows operating system, such as: Windows 98, Windows Me, Windows NT, Windows 2000, Windows 2003, Windows XP and Windows Vista.

  • zwr says:

    You can use Advanced Outlook Repair to solve the problem, by either converting it into Outlook 2003 format , or splitting it into smaller pieces.

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