diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7cad9067..7e1de6de 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+5.1.2
+-----
+
+- Workaround unexpected Office365/Exchange IMAP responses
+
 5.1.1
 -----
 
diff --git a/docs/index.rst b/docs/index.rst
index e704f7b4..b53a71f0 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -396,7 +396,7 @@ Installation
    ::
 
       http_proxy=http://user:password@prox-server:3128
-      https_proxy=http://user:password@prox-server:3128
+      https_proxy=https://user:password@prox-server:3128
       ftp_proxy=http://user:password@prox-server:3128
 
    Or if no credentials are needed:
diff --git a/parsedmarc/__init__.py b/parsedmarc/__init__.py
index 79a362dc..015308f4 100644
--- a/parsedmarc/__init__.py
+++ b/parsedmarc/__init__.py
@@ -38,7 +38,7 @@ from parsedmarc.utils import is_outlook_msg, convert_outlook_msg
 from parsedmarc.utils import timestamp_to_human, human_timestamp_to_datetime
 from parsedmarc.utils import parse_email
 
-__version__ = "5.1.1"
+__version__ = "5.1.2"
 
 logger = logging.getLogger("parsedmarc")
 logger.debug("parsedmarc v{0}".format(__version__))
@@ -1171,6 +1171,35 @@ def get_dmarc_reports_from_inbox(host=None,
         return results
     except imapclient.exceptions.IMAPClientError as error:
         error = error.__str__().lstrip("b'").rstrip("'").rstrip(".")
+        # Workaround for random Exchange/Office365 IMAP errors
+        if "Server Unavailable" in error or "BAD" in error:
+            sleep_minutes = 5
+            logger.debug(
+                "Received Server Unavailable response"
+                "Waiting {0} minutes before trying again".format(
+                    sleep_minutes))
+            time.sleep(sleep_minutes * 60)
+            results = get_dmarc_reports_from_inbox(
+                host=host,
+                user=user,
+                password=password,
+                connection=connection,
+                port=port,
+                ssl=ssl,
+                ssl_context=ssl_context,
+                move_supported=move_supported,
+                reports_folder=reports_folder,
+                archive_folder=archive_folder,
+                delete=delete,
+                test=test,
+                nameservers=nameservers,
+                dns_timeout=dns_timeout,
+                strip_attachment_payloads=strip_attachment_payloads,
+                results=results
+            )
+
+            return results
+
         raise IMAPError(error)
     except socket.gaierror:
         raise IMAPError("DNS resolution failed")
@@ -1433,7 +1462,7 @@ def watch_inbox(host, username, password, callback, port=None, ssl=True,
     except imapclient.exceptions.IMAPClientError as error:
         error = error.__str__().replace("b'", "").replace("'", "")
         # Workaround for random Exchange/Office365 IMAP errors
-        if "Server Unavailable. 15" in error or "BAD" in error:
+        if "Server Unavailable" in error or "BAD" in error:
             logger.debug("IMAP error: {0}".format(error))
             logger.debug("Reconnecting watcher")
             server = imapclient.IMAPClient(host)
diff --git a/parsedmarc/cli.py b/parsedmarc/cli.py
index 3830ab74..cba69e8b 100644
--- a/parsedmarc/cli.py
+++ b/parsedmarc/cli.py
@@ -372,7 +372,7 @@ def _main():
                         test=args.test, nameservers=args.nameservers,
                         dns_timeout=args.timeout, strip_attachment_payloads=sa)
         except IMAPError as error:
-            logger.error("IMAP Error: {0}".format(error.__str__()))
+            logger.error("IMAP error: {0}".format(error.__str__()))
             exit(1)
 
 
diff --git a/setup.py b/setup.py
index ca6ad734..1939fc70 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@ from setuptools import setup
 from codecs import open
 from os import path
 
-__version__ = "5.1.1"
+__version__ = "5.1.2"
 
 description = "A Python package and CLI for parsing aggregate and " \
               "forensic DMARC reports"