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I believe if the mailbox hasn't been explicitly deleted its still there:<br />
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A disconnected mailbox is a mailbox object in an Exchange mailbox database that is not associated with an Active Directory user account. When you remove or disable a mailbox, the data that is stored in the Exchange mailbox database is no longer associated with the user account in Active Directory and becomes a disconnected mailbox.
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I believe if the mailbox hasn't been explicitly deleted its still there:

A disconnected mailbox is a mailbox object in an Exchange mailbox database that is not associated with an Active Directory user account. When you remove or disable a mailbox, the data that is stored in the Exchange mailbox database is no longer associated with the user account in Active Directory and becomes a disconnected mailbox.

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What version of server are you running and what version of Exchange?<br />
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I believe though that the mail box gets marked &nbsp;to be deleted when a clean up of the exchange server happens. &nbsp;You can go into the exchange managment utility and look to see if the mailbox still exists. &nbsp;If it does then it should be possible to re-assign that mailbox some where else. &nbsp;Let me know what verison of Exchange and I will provide some more specific information.
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What version of server are you running and what version of Exchange?

I believe though that the mail box gets marked  to be deleted when a clean up of the exchange server happens.  You can go into the exchange managment utility and look to see if the mailbox still exists.  If it does then it should be possible to re-assign that mailbox some where else.  Let me know what verison of Exchange and I will provide some more specific information.

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This is going to sound like a noob question, but none-the-less, I still need help. &nbsp;I just started with this company, but someone deleted a user out of Active Directory about two months ago, and someone in the company needs access to that user's emails. &nbsp;Any advice? &nbsp;
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This is going to sound like a noob question, but none-the-less, I still need help.  I just started with this company, but someone deleted a user out of Active Directory about two months ago, and someone in the company needs access to that user's emails.  Any advice?  

If an account in Active Directory is deleted, what happens to that users mailbox?

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.

Email Servers

Network Management involves issues that are independent of specific hardware or software, including email policies, upgrade planning, backup scheduling and working with managed service providers for Desktop-As-A-Service (DaaS), Software-As-A-Service (SaaS) and the like through the use of tools, coupled with manufacturer standards, best practice guidelines, policies and procedures plus all other relevant documentation. Network management also includes monitoring, alerting and reporting, management reporting, planning for device or service updates, the backup of configurations, the setting of key performance indicators and measures (KPIs/KPMs), associated service level agreements and problem records as part of the IT Service Management (ITSM) framework.

Network Management

Servers are computing devices that are similar to desktop computers in that they have the same basic components, but are significantly different in size, configuration and purpose. Servers are usually accessed over a network, and many run unattended, without a computer monitor, input device, audio hardware or USB interfaces. Many servers do not have a graphical user interface (GUI), and are configured and managed remotely. Servers typically include hardware redundancy such as dual power supplies, RAID disk systems, and ECC memory, along with extensive pre-boot memory testing and verification. Critical components might be hot swappable, and to guard against overheating, servers might have more powerful fans or use water cooling.