Following are some different methods to manually convert EDB to PST

Method 1: EDB to PST Conversion using PowerShell Cmdlets
For Microsoft Exchange 2007 to PST: Use Export-Mailbox
For Microsoft Exchange 2010 to PST: Use ExportMailboxRequests
For Microsoft Exchange 2013 to PST: Use New-MailboxExportRequest command
Before converting Convert Exchange Server EDB to PST format using PowerShell, Create a separate folder to save the converted PST files from EDB and give any name to the folder. After that right click on the folder which will show you the Properties -> select the Share Folder. Then assign the Read/Write permission and click Share button.

The Shared path example: \\MSServer\new-pst-folder

For Exchange Server 2007

Use below given Powershell commands to Convert Exchange 2007 EDB to PST format.

1: Simply Run the Powerhsell command given below:Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2007
Then Extract PST file from Exchange Server EDB by using the command given below:Export-Mailbox -Identity abc@expertdotxyz -PSTFolderPath \\MSServer\new-pst-folder\Expert-Advice.pst
For Exchange Server 2010 and Exchange Server 2013

Use below given Powershell commands to Export Exchange 2010 and Exchange 2013 EDB to PST format

Run the below given Command:For Exchange Server 2010 Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010For Exchange Server 2013 Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2013
Convert EBD to PST by using below-given command:New-MailboxExportRequest Mailbox Expert-Advice FilePath \\MSServer\new-pst-folder\\Expert-Advice.pstWhere Expert-Advice is the name of users mailbox that we want to convert in PST file format.

Method 2: Export Exchange 2013 mailbox to PST using Exchange Admin Center (EAC)
Simply use the steps mentioned below to perform the EDB to PST Conversion:

First, you need to create a Shared Folder where you want to export the mailbox. Then Set the Shared and Security level, by clicking on the Permission tab.

Now Assign Mailbox Import Export permissions to the user, follow the below steps to assign the permission.

First you need to open EAC (Exchange Admin Center) then click Permission. After that double click on Recipient Management and click on Add in the top of Role.
Now in the page of Select a Role, you need to click on Mailbox Import Export option -> Add (bottom left hand side) -> OK.
Then click Add in the Roles section and select Mailbox Import Export in a new page. Click Add -> OK.
Once the above process completed Export Mailbox data into PST, to do this follow the below steps:

Open EAC, choose Mailboxes and a list of mailboxes will display. Simply select the mailboxes which you want to export into PST.
Then right click on the mailbox and select Export to a PST file. Click on Browse to select the mailbox and click.
You can find the path of exported mailboxes using syntax: \\MSServer\new-pst-folder\Expert-Advice.pst
After that Click Finish, once the process completed.

Hope you find this helpful.