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Does Word check spelling/grammar on Microsoft's servers or on my computer?

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Have you tried disconnecting from the network and seeing if it still works? – ChrisF Mar 17 '12 at 23:59
noit is done with the help of a software installed in your program . this has nothing to do with your Interne – user123580 Mar 18 '12 at 10:42
-1 for not accepting an answer – HaydnWVN Mar 26 '12 at 13:01
up vote 11 down vote accepted

No it doesn't.

When you install Microsoft Office, it will install a dictionary of your main language - however, this isn't much more than a list of words. You can also install additional languages later. You do not need an internet connection for this.

In addition, in any Office program, you can hold down Alt and click on any word to perform research on it - this includes translating, dictionary (with full definition) and thesaurus. All of these research features require an internet connection.

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Thanks @surfasb for that, Guess I wasn't clear... done a little more. – William Hilsum Mar 19 '12 at 8:26

(this information is current as of Word 2003)

All spellchecking is local. The spellcheck data is stored in the file CUSTOM.DIC in
C:\Documents and Settings\<user>\Application Data\Microsoft\Proof. (WinXP path)

You can add, edit, and remove dictionaries used in Word; go to
Tools -> Options..., select the tab Spelling & Grammar and click on Custom Dictionaries....
Here you can check what the file is on your system and it's location

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It checks spelling on your own computer (tested with Microsoft Office 2010 on a VM)

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