How to increase or rebuild OST file in outlook 2003?

I just hit the mailbox limit in my .OST file. Mailbox Cleanup says its sitting at 1.75Gb (which is close enough to the supposed limit of 2Gb).

How can I increase the size?

Or: failing that...

How can I rebuild it? (It was set to download headers and Full Items, so I would rebuild it and set it to download headers only, thus saving a lot of space - this works on my other installation of Outlook2003, which is viewing the same mailbox with no size issues...)
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Amit KumarCommented:
Please follow this article to increase size by a registry entry.

Registry path in case of Outlook 2003 is HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\11.0\Outlook\PST
DeepinInfrastructure Engineer Commented:
You can rebuild the OST file by simply renaming the name the file.

When outlook opens it will recreate the file automatically for you.

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Are you using a PC or a laptop? If it is a PC that is always in your company, you  don't need an OST file, as you are always connected to the exchange server anyway, and the OST file is just a cache of your exchange mailbox. Having an OST file in this situation does nothing except increase your network load and wastes your diskspace. Just disable cached mode in your outlook's profile.

If it is a laptop that isn't always connected to your exchange server, then cached mode is OK, Use archiving to move out old messages, that creates pst archive files, or delete messages you don't need anymore.
zorba111Author Commented:
I tried the registry keys but it didn't make any difference.

Renaming the OST file, and setting it to download headers only did the trick, thanks.

The old one with "Full Items" was 2GB, this new one is about 0.5GB.
Feriha JoshiCommented:
You can rebuild the OST file by deleting the local OST file and rebuild the OST files with Outlook from scratch when the connection between the Microsoft Exchange Server and the Outlook user’s profile is recreated .You can also rename the old OST file and then synchronize the renamed OST file with the Microsoft Exchange Server.
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