While using Outlook, users get a 20MB cap on the file size of their attachment, i.e., a user can only mail file(s) as big as 20MB in one email. This size limit has been seen even with the latest ...

In case the size of your PST file is larger than 100 GB, then you can use both solutions i.e. you can increase the maximum size limit for .pst files and then compress the file.

Upgrade Outlook from 2003 to 2007 or 2010 with its higher maximum file size of 20 GB. Click to expand... 2003 is already 20gb, previous versions are 2gb. 2007 and 2010 are 50gb max (by default).