Yes, F-PROT Antivirus for Exchange offers automatic updates of the virus signature files with or without user intervention, directly from our site:

Insert the ideal time for updates in the time field. Note that this is a 24 hour format so if you want F-PROT Antivirus for Exchange to update at eleven o'clock in the evening you should type 23:00 into the time field.

Please note! As most users set the updater to check for and download new virus signature files on the hour (e.g. 9:00 or 16:00) you can optimise your download speed by setting the updater starting time to any number of minutes past the hour (e.g. 9:07 or 15:43). In this way you avoid the heaviest download traffic.

You choose the weekdays to update by checking the boxes on the left of them.