Актуально...

Windows 2003 Srv SP1 + Office 2003 SP2

Глюк такой наблюдается. См. microsoft.com KB899266

SYMPTOMS
When you try to paste data into Microsoft Office Excel 2003 during a Terminal Services session on a Microsoft Windows Server 2003-based or Microsoft Windows XP-based computer, you receive the following error message:
Cannot empty the clipboard.

CAUSE
This problem may occur if the computer that you use to connect to Terminal Services has multiple processors and if you use Remote Desktop Connection (Mstsc.exe) in the same Terminal Services session that you use Excel 2003.

Note If you stop using Mstsc.exe in the Terminal Service session, you can paste data into Excel 2003 without receiving the error message that is mentioned in the "Symptoms" section.

RESOLUTION
Windows Server 2003
Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows Server 2003 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)

Насколько я понял, дело не в Excel, а в Windows. Что ж, будем ждать следующего СЕРВИСПАКА !!!

Проблема решена !

Устанавливаем windows 2003 sp2 beta 2786 . Брать тут , 378.72 Мб, да... большой, но что поделаешь...