Hello Ishan, I'm not seeing the same issue when I check against my development SmarterMail email server, however, this might have already been fixed as a result of some other changes (just not released to the public yet). We might be releasing a build tonight and I would recommend you update and see if the issue is resolved.
Also, in looking at this issue we found that the size being reported on the user's disk space report was also including shared folders (which it should not) so we'll have a fix for this as well in the next release.
Thanks!
Larry Duran
Software Developer
SmarterTools Inc.
www.smartertools.com