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I just found this article which seems to indicate that 2 edge transport servers that are different version different versions(2007/2013) can co-exist. <a href="https://technet.microsoft.com/en-us/library/dn151300%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396" rel="ugc">https://technet.microsoft.com/en-us/library/dn151300%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396</a>
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I just found this article which seems to indicate that 2 edge transport servers that are different version different versions(2007/2013) can co-exist. https://technet.microsoft.com/en-us/library/dn151300%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396 [https://technet.microsoft.com/en-us/library/dn151300%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396]

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I currently have 2 exchange 2007 Edge Transport servers running but need to replace them due to aging HW &nbsp;and the fact that Microsoft no longer supports Exchange 2007. &nbsp;So I wanted to know if I have an Exchange 2007 Edge Transport and Exchange 2013 Sp1 Edge Transport server working concurrently until i replace both legacy exchange servers?
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I currently have 2 exchange 2007 Edge Transport servers running but need to replace them due to aging HW  and the fact that Microsoft no longer supports Exchange 2007.  So I wanted to know if I have an Exchange 2007 Edge Transport and Exchange 2013 Sp1 Edge Transport server working concurrently until i replace both legacy exchange servers?

can exchange 2007 edge transport  and exchange 2013 edge transport co-exist ?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.