How to Compact Your Local Outlook File and View its Compacted Size.

You can compact your local copy and then see what it has reduced to by doing this:

On Outlook’s main page click the File Tab which puts you on the “Info” section:

Click the Account Settings button menu and on that select “Account Settings”.

This dialog will appear:

Select your mailbox and then click “Change” as highlighted above.

This dialog will appear:

Click “More Settings”.

On the next dialog that comes up, select the “Advanced” tab at the top:

Click the “Outlook Data File Settings …” button.

This dialog will appear:

Click “Compact Now” and then click “OK” on this dialog and “OK” on the one above.

This will return you to this screen:


Click “Next”.

This will take you to this dialog:

Just click “Finish” to complete the compacting process. Your local copy of the mailbox should now be at the new size after the archiving.

To see what size it is now go to the tree down the left side of Outlook’s main page and right-click the mailbox name:

Select “Data File Properties” from the menu that appears as shown above.

This dialog will appear:


Click the “Folder Size …” button.

This dialog will appear:


The figure circled is the size of your mailbox after archiving and then running the compact to remove the items that went to archive fully from the database.

As you can see it quotes the figure as KB (well it does on my version, it may be yours is different) but if yours is in KB then all you have to do is take the figure and starting from the right put in commas every three characters working left. So in my case that is:Starting figure: 1013802

Put in commas: 1,013,802
So the 802 is KB, the 013 is Megabytes and the 1 is Gigabytes so my mailbox is 1.013GB in size. Or 1GB, 13MB and 802KB in size.