Exchange Server Event ID:505

Yesterday I was called in by a customer to resolve a mount issue on a Microsoft Exchange Server 2003 database. This one was new to me and easy to resolve!
I could see "Event ID: 505" in application logs saying:

Information Store (2028) An attempt to open the compressed file "drive:\Exchsrvr\MDBDATA\priv1.edb" for read / write access failed because it could not be converted to a normal file. The open file operation will fail with error -4005 (0xfffff05b). To prevent this error in the future you can manually decompress the file and change the compression state of the containing folder to uncompressed. Writing to this file when it is compressed is not supported."

Exchange server 2000 service pack 3 and later versions can not open databases which are compressed with NTFS compression feature. So the only resolution would be to uncompress the folder holding exchange server databases. for me this worked nice but Microsoft also recommends running an offline defragmentation (eseutil /d "database location") before mounting the database.
For more info check this:
Database does not mount, and you receive error 0xfffff05b after you apply SP3 to Exchange 2000