Hi,
If you're using Dropbox (or a similar service), you could share the Boxcryptor Classic Folder with your co-workers in Dropbox and tell them the password of the folder. They can then download and install Boxcryptor Classic on their devices and use the password to open the Boxcryptor Classic Folder.
Best regards,
Robert
PS: In Boxcryptor 2.0 you can share access to the encrypted files without having to tell your co-workers any password and you can manage access to every single file (instead of the whole Boxcryptor Classic Folder).