Common Logo for the "MailStore" Software

We need a comon logo for our popular MailStore product line consisting of MailStore Server, MailStore Home, MailStore Proxy etc.

http://www.mailstore.com

We need a professional, solid and fresh logo that
- integrates the brand "MailStore" with a recognizable graphic
- should reflect the simplicity of the software
- and yet look solid / trusty as a storage solution for company's valuable e-mailMailStore is an easy, assessible, flexible and affordable product which comes with superior and reliable archiving technology.

About us:

deepinvent Software GmbH is a dynamically growing German IT company, specialized in the development and sales of e-mail archiving solutions.
With our "MailStore" product series it is our aim to make e-mail archiving reliable and efficient for all users and companies.

- Logo should be combinable with suffixes such as Home, Server, Proxy, Professional etc.
- Our square organges (see http://www.mailstore.com/en) is currently used quite often, so they could be integrated if someone has a good idea how this could be done. However, this is absolutely not required.
- The font *currently* used for the "MailStore" writing is Avenir 85 Heavy from Linotype. This might be used in the future, but doesn't have to.
- Deliverables have to include the logo copyright, the logo in its original vector format and a transparent large PNG for immediate use.

- We don't want a complete redesign of our website and other material, so the logo should in some way "fit" into the existing appearance. Find some CI material here:
http://www.mailstore.com/en/mediacenter.aspx