In Word Ctrl+5 is the default setting for line spacing of 1 1/2 lines. (Tools=>Customize=>Commands=>Keyboard)
There isn't a default command for strikethrough, but if I reassign Ctrl+5 to Format=>Strikethrough, it does work for selected text
to toggle strikethrough on/off.
(numeric keypad 5 is seen as a different key from the '5' in the top row of the keyboard)
=========
When I try to use the CTRL+5 keyboard shortcut to apply or remove
strikethrough in Microsoft Word 2000, nothing happens. We have tried several computers in our office and none of them will do it.--
I hope this helped you,
Bob Buckland ?

MS Office system products MVP
LINKS to the 2007 Office System
1. Free MS Office 2007 book from MS Press, 213 pages:
http://microsoft.com/learning/office2007/default.mspx#booksfrommspress
2.. Office 2007 Beta 2 Online Test Drive, Downloadable beta,
e-learning courses, doucmentation and movies:
http://microsoft.com/office/preview
3. Send 2007 Office System Beta 2 feedback directly to the MS Office 2007 product team with this feedback tool:
http://sas.office.microsoft.com/
4. Try the 2007 OfficeOnline preview website , without Office2007
a. Install the ActiveX access control
http://office.microsoft.com/search/redir.aspx?AssetID=XT101650581033
b. then visit
http://officebeta.iponet.net