All,

Is there any way to modify the current archival limit from 50 GB to 1 GB or any other value. As of when we enable archive mailbox on the users then the default archive limit is set as 50 GB. It is bypassing the limit applied on archival database.

Another management task related to the personal archive feature is to define the quota. By default this is 50GB and 45GB (warning) in Service pack 1. We can change such values, going to the Mailbox Settings tab, double click on Archive Quota and then we can define the new archive quota for that specific user. If you want to adjust the limit on several users the Exchange Management Shell is a better way to go

Have a look here:

http://www.msexchange.org/articles-tutorials/exchange-server-2010/compliance-policies-archiving/managing-personal-archive-exchange-server-2010-part2.html