Ich weiss nicht, ob Dir das weiter hilft, schau mal rein (english)
OWA Signature's location?
oder so:
1) Posted the desired logo file to a publicly accessible web site
2) Opened OWA and signed into my account
3) Selected "Options" from the bar on the left
4) Clicked the "Edit Signature..." button.
5) Opened a second browser window and navigated to the url of the publicly available logo file I posted in step 1
6) Clicked on the logo image in the second browser window and dragged it to the appropriate location in the "Edit Signature" window. Saved the signature.
Servus
F, von
C ohne
K