Exchange DBs (edb file) unexpected growth (with plenty of "white space" should be available) - Exchange 2010

Problem: Exchange DBs (edb file) unexpected growth (with plenty of "white space" should be available) - Exchange 2010

Apparently, this is the issue of Exchange 2010 for databases created pre-Exchange 2010 SP3 RU1.

Resolution:

1.       Get-MailboxDatabase -Status | ft name,AvailableNewMailboxSpace

2.       Start Extra and leave it run in circular logging..

a.        Run Extra (Start -> Run -> Extra) 

b.      Go to the welcome screen

c.        Choose Select a task 

d.      Choose Trace Control (Click OK on any pop up that appears)

e.      Leave default options (max trace file size 100MB, circular logging, select trace tags manually) 

f.        Click Set Manual Trace Tags 

g.       Select all checkboxes under Trace Types 

h.      Choose "Store" under "Components to Trace" 

i.         Choose "tagCleanupMsg" under Trace Tags 

j.        Click Start Tracing 

3.       Let this run for 20 minutes.

4.       Get-MailboxDatabase -Status | ft name,AvailableNewMailboxSpace

    Running Extra with parameters above makes Exchange starting reclaiming "white space"