Why Upgrade from ANSI to Unicode? To upgrade PST files is performed when you have files in earlier Outlook version (from 98 to 2002). Files under these versions have 2GB (65 items in every folder) storage capacity limit. Once this limit gets over, Outlook start acting slow and in addition to this corruption is likely to appear which further can cause serious problems.
Solution: PST Upgrade application will convert ANSI PST files to Unicode (from 2003 to 2010) format means from 2GB to any limit all depends on hard disk storage space. As standard format is 20 GB.
Why Degrade from Unicode to ANSI? On contrary, it also becomes a need to degrade PST files. You have mailbox in Unicode format but you are using Outlook in earlier version say ANSI, then how will you access and read those emails. You do not have Outlook in Unicode format then option is to reduce PST file size from ANSI to Unicode (change PST format from ANSI to Unicode) which makes it possible for you to read and access PST emails.
Solution: Using software from baggage will help you in reducing PST file size. Once they get degraded you will access PST files and can make use of them.
Conclusion: Our third-party helper as it is camouflage in the form of ease and comfort that can perform twin operations –Upgrade as well as Degrade PST both. It all depends on your requirement whether you need to upgrade your PST files or you need to degrade them. Both areindispensably done with this external application