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Why is there a size difference between Local Data & Server Data?

We have some users in Exchange Cache Mode that when comparing Local Data vs. Server Data there is a large difference.  

One user in particular is showing that their Calendar size via Local Data is about 1MB in size but when you look at the Server Data it showing about 24MB.

Why is there a size difference between Local Data & Server Data?

Thanks
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Admin_Stooge
Asked:
Admin_Stooge
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3 Solutions
 
Justin DurrantSr. Engineer - Windows Server/VirtualizationCommented:
That's normal.

Trust the size on the server.. The OST file size is never going to match the mailbox size.

However, I'd still check the "Sync Issues" folders (if they exist) to see if
there's a problem. The OST may be damaged and might not be receiving
all the mail the server mailbox does. Of course, the assumption here
is that every folder is sync'd, and that may not be true. It may also
be that not every message s sync'd, either!
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Admin_StoogeAuthor Commented:
What is the best practice for local site IT Support to follow to help if the size difference is great?
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Justin DurrantSr. Engineer - Windows Server/VirtualizationCommented:
You could delete the OST and reenable cached mode and see if that makes a difference
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gupnitCommented:
Hi,
There are loads of reasons Ex dumpster etc etc
Rather than listing them all here, refer http://social.technet.microsoft.com/Forums/en/exchangesvrgeneral/thread/e31b6c63-4856-4810-9683-65c7ada21bdc
Thanks
Nitin
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gupnitCommented:
Also I would keep Exchange sizes as final as they are what matters on the Server
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funtieeCommented:
There are a number of reasons for that:
1.
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Admin_StoogeAuthor Commented:
One:
The two sizes are not the same, now normally they arent far apart, but as time goes on and people get closer to their limit (300MB) the differences between them starts to grow to substantial size.

Example:
One user even now at 78 mb server size says 58 mb local data.
And the difference seems to be in the calendar mostly. (other times it is other folders for people)

But there has been times when the difference is 50 mb to 100mb and this causes major problems.

What has been done when it gets this bad is re-name the cache file and then re download a new one.

This lowers the difference back down to 20 to 50mb at most, or lower.

But the problem still remains.

Two:
When people get warring about their size limit doesnt come accurately.

People have seen warnings not come until after the size is over the limit, because it seemed to only send out a warning based on local size not server size.
Other times I have seen warnings come out on server size but then people look at the folder size it defaults to local data and so they dont get an accurate reading of their size limits and arent knowledgeable enough to look at server data to realize that is really what matters.


So bottom line:
If you could find out what causes the difference in sizes between cache and server, and any way to minimize or make them the same would be greatly appreciated.
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gupnitCommented:
Move Mailboxes to New DB, you will get them closer.
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Admin_StoogeAuthor Commented:
So each time this becomes an issue we are to move the mailboxes to a new DB?
That does not seem right
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gupnitCommented:
But this is not an Issue at all. Why are you considering comparing sizes?
 
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Admin_StoogeAuthor Commented:
I'm not comparing sizes...LOL...I know not to but I have this local site IT individual up in my grill asking for info....LOL
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gupnitCommented:
Hmm tell him and show him this Page, he should be fine :-) !
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shauncroucherCommented:
As already stated, it is totally normal to see difference sizes for local data compared to server data.

The local data sizes are taken from the OST file whereas the server data is the size of the mailbox.

When you want to clarify the size of the mailbox in terms of mailbox limits, it is the server data you should be interested in.

The local IT person looking at the 'local data' portion needs to be told that this information is irrelevant when measuring for mailbox size limitations.

Shaun
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