Hi Barbara,

There are three types of content control you can't tab out of in a document with forms protection: rich text & building block; and checkbox (checkbox content controls don't exist in Word 2007). You also can't tab into a checkbox. You can tab out of a date-picker, provided there's another content control after it; this applies to the others not already mentioned too. If, however, you use the 'no changes' protection and mark the content controls as exceptions, you can tab through all except rich text & building block. The rich text & building block controls behave differently because they can accept tab characters as inputs.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]