Exchange mailbox size larger on Server than on Client

I think this is an Exchange 2003 problem, not an Outlook 2007 problem so I am asking it here instead of on SuperUser.

When I look at the folder size of my mailbox the Local Data tab shows 4099KB for my Calendar, but the Server Data shows 154671KB. I open the calendar, switch the view to By Category so I can see each calendar item as a list item, add the Size column and I see about 4MB of data across the list.

My question is: What can I do to clear this out on the server? I have tried archiving but nothing changes? My company's exchange people don't know, they just keep sending me back to delete things from my mailbox, but our limit is 100MB and if I delete everything in the mailbox I am still over the limit until this problem on the server is solved.

Thanks for your help.

I found the similar issue. But unfortunately I do not have access to the web-mail version. So I went to :

File > Account Settings > Account Settings : Select you account in the list then click Change

Another way of reaching the same window :

File > Account Settings > Account Name and Sync settings...

Unchecked the "Cached Mode" and restarted Outlook.

Now all my Server Items started showing up in the Local Outlook. So you can now delete / move whatever you want.

After that, if you want, again move back to Cache mode using above menu & restart Outlook.

Hope this helps..

If you have set the "Mail to keep offline" set to 'All', the mail size locally will be the same at server data. If you have set it to e.g 12 months, the lacal data size can be smaller.